Positive pipe tongs



y 1, 1930; R; RAMSAY Y 1768;787

:PO'ISITIVE PIPE TONGS Filed Sept. 8, 192a R0 m5. By ww Patented July 1,1939 ROBERT Ramsay, on SAND SPRINGS, OKLAHOMA rosrrrvn PIPE Tones nppl ieation'filed September a, 1922:. Serial no. 304,324.

day are deficient in'that part of the forceexerted by the operator oft-hervvrench 1s- PrQp r Po needed to hold the wrench; in its tion uponthe engaged ob ect; 7

My invention has for-its object, first,the

provision of tongswhich will so grip they work as to allow all oftheoperators turn ing effort to be used to rotate the casing; second, toprovide a wrench which lssymmetrical abbut its center whereby it willnot tend to twist in the operators handslwhen being used; third, toprovide symmetrically I arranged gripping teeth whereby the engaged workwill not be crushed; fourth, to

provide a-wrench which maybe locked in its operative position; andfifth, to provide a wrench which may be readily stood upo its heavy endwhen not in use. j

These objects, together w'i h and corresponding accomplishments, are 0bt ained by means of the embodiment. of. my

invention illustrated in the accompanying drawing in which: I

Fig. 1 is a plan View of the wrench in a position just before it uponthe pipe. r

Fig. 2 is a cross'sectional view through the head of my wrench on theline 2-2 of Fig. 1, the handle and jaws of the wrench 4 being omitted. y

Fig: 3 is a sectional view taken along line 3 3, Fig. 2, one of the jawsbeing omitted.

Fig. 1 is a cross sectional view on line 4-4, Fig. 3, showing thedetails of the two pivoted joints.

Fig. 5 is a view along line 55 of Fig. 1 showing the pawl and ratchetconstruction which is mounted on the handle whereby the handle is heldor locked in an operative posi tion.

other objects has been pushed Fig. 6 is a view takenalong line 66, Fig.4;,Sl1OWlI1g the details of the knuckle joint whereb F shows adiagrammatic sketch illustratlng the toggle arrangement "of the jaws eof the turningforce is lost in whereby non holding the jaws of thewrench in relationship to their work.

Corresponding parts in all of the figures' are designated by the samereference characters.

Referring with particularity to the drawing, the improved wrench, tongsor imple ment thereln shown, comprises inthe main a cast iron or steelcasing member or head 10, havlng a and :pivo

handle 20 and two rockers 30- tally mounted thereon. Upon y the" pintherein is relieved of shearin stress.

gripping these rockers are respectively pivotally v mounted jaw s and60. Both rockers and aws areudentical except one'set is right hand andthe other set is left hand.

Referring now more particularly to Fig. 1

1, 10 designates the hollow semi-circular oasing or "head having holes11, 12 and 13 extending therethrough. Thehole," 12, is the consequentlyin conjunction-with a pawl '26 mounted on the handle,

. point aboutwhich the handle 20 pivots and the ratchet teeth 14:, whichact are circumferentially formed G and S are cular casing formedintegrally with the cir- 10. These lugs extend horizontallyfrom'the'casing when the wrench is not being end as the contact with thewrench in a convenient position for use.

Handle 20 is in a-vertical position; When the wrenchused it. may bestood on its rockers and jaws .recede back into the casing 10. Thus thelugs come in the floor and aid in holding is pivotally mounted inside ofthe casing head by means of a pin 15 which passes through a hole 16 inthe end of the handle.

(Jam surfaces 21'and 22. are prov vided near the pivoted end of thehandle as clearly show n in Fig. 3'. A small lug 23 prevents excessivemovement of the handle A- small -c hamber 2 1 is formed integralwiththe, handle and a spring 25 and a plunger 18 are housed therein.This spring is connected to the plunger and is compressed by. inwardmovement of same.

Pawl 26 is pivotably mounted upon the handle 20, by means of a stud 27.This pawl has s uare surfaces19 and 28 as-shown in Fig. l. rdifnarilythe plunger 18 is held in engagement with the shoulder or square surface19 thus rendering the pawl and ratchet locking means inoperative.However, when the tongs are operated by 'two or more men it is desirableto lock them in place and this is accomplished by turning the pawl sothat surface 28 contacts with the plunger. 'A small lug 31 provides ameans for the. release of the pivot.

The hole 11 in the main head provides a seatfor the pivot pin 33 and thehole 13 provides a seat for the pivot pin 32. These pinsare rigidlyattached or made integral with'the corresponding rockers'30 and 40.Rockers and are providedwith surfaces 34 and 35, respectively, upon thatend which is opposite to the camming faces 21 and 22 on the lever 20.These rockers also have holes 36 and 37 in which pins 38 and 39 areplaced. As shown in Fig. 6 these holes are in the end portion of therocker opposite to the cumming end. These rock- M3 30 and 40 areprovided with bifurcated ends 41 and 42 which form part of the knucklejoint between these rockers and the j aws themselves. Jaws and 60 arepivotally mounted upon pins 38 and 39 in the rockers 30 and 40respectively. Jaw 50is provided with steel points 32 and 33. Thus theoutward move teeth 51 and 52. Jaw 60 is provided with teeth 53 and 54.These teeth are symmetricall placed about the circumference of the P wor(with which they engage. Jaws 50 and 60 are provided with rearwardlyextending fla es 55and 56 which have holes 57 and 58 t erein. The pivotpins 38vand 39 hold the jaws in place.

As clearly shown in Fig. 6 the jaws are" provided with a curved surfacecorrespond ing in shape to the curved surface 42-on the rockers wherebyknuckle joints are formed between the rockers and its jaws. Thus thepins 38 and 39 are relieved of any shearing stress during the workingstroke of the wrench.

Fig. 7 shows a diagrammatic sketch illustrating in part the operation ofthe tongs or wrench. This figure shows the rockers 30 and 40- pivotallymounted at the fulcrum ment of these two rockerscaused by the camportion on the handle causes the pins 38 and 39 to advance towards thework. However, the construction of this toggle arrangement 'ofthe wrenchis such that the center of the work, designated by O, is at a short.

distance back of the point P, which is the toggle center of thismechanism. Thus, all the force exerted as turning efiort will be exertedon the work as the tendency of the wrench will be to move in thedirection opposite to that shown by the arrow, A.

The force exerted along arrow A will be opposed by the reaction of thepoint, C, on the casing, 10, and hence, after the initial ositioningmovement or tendency toward movement of the wrench will occur.

There are other objects, advantages and features of construction andorganization,

ber and having cam surfaces thereon, rockers pivotally mountedinteriorly of the hollow member'and having one of their ends extendingadjacent to the cam surfaces whereb the will be operated by themovemento the handle about its pivot, gripping members pivotally mountedon the other ends of the rockers, said hollow member ex tending past thegripping members when they are in their operative position.

2..In a wrench having a handle and grippin 'members and intermediaryconnecting mee ianism, the combination of a casing which provides asupport for the above re-- ferred to elements, said casing extending astthe above elements and terminating in a plane which is approximatelynormal to the axisrof the handle when the handle is in its middle orcentral position.

3. A device of the character deslscribed comprised ofa hollow casingmember open atone side and having another opening at the oppositeside, ahandle extended th rough said ,last named opening and pivotally mountedwithin the casing member, rockers pivoted in the casing, jaws pivoted to1 the rockers, said casing extending past or around the rockers and awsand terminatmg in a Hat portion, said casing member having lugs formedthereon which extend in a direction parallel to the flat portion.

'In testimony whereof he affixes his signature.

' ROBERT RAMSAY.

